fix the cpu estimatedTotal memory + get the expiry time for loading models (#4461)

llm/server.go

@@ -89,6 +89,7 @@ func NewLlamaServer(gpus gpu.GpuInfoList, model string, ggml *GGML, adapters, pr
 
 		cpuRunner = serverForCpu()
 		gpuCount = 0
+		_, _, estimatedTotal = EstimateGPULayers(gpus, ggml, projectors, opts)
 	} else {
 		if gpus[0].Library == "metal" {
 			memInfo, err := gpu.GetCPUMem()